package com.zhuliwei.cloud.mygateway;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 自定义全局filter统计controller下的各个接口的耗时情况
 *
 * @author 朱力维
 * @time 2025/1/15 15:39
 **/
@Component
@Slf4j
public class MyGlobalFilter implements GlobalFilter, Ordered {
    private static final String BEGIN_VISIT_TIME = "begin_visit_time";//开始访问时间

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //先记录下访问接口的开始时间
        exchange.getAttributes().put(BEGIN_VISIT_TIME, System.currentTimeMillis());
        return chain.filter(exchange).then(Mono.fromRunnable(() -> {
            Long beginVisitTime = exchange.getAttribute(BEGIN_VISIT_TIME);
            log.info("访问接口主机: " + exchange.getRequest().getURI().getHost());
            log.info("访问接口端口: " + exchange.getRequest().getURI().getPort());
            log.info("访问接口URL: " + exchange.getRequest().getURI().getPath());
            log.info("访问接口URL参数: " + exchange.getRequest().getURI().getRawQuery());
            log.info("访问接口时长: " + (System.currentTimeMillis() - beginVisitTime) + "ms");
            log.info("我是分割线: ###################################################");
            System.out.println();
        }));
    }

    /**
     * 返回的数字越小代表优先级越高
     *
     * @author 朱力维
     * @time 2025/1/15 15:39
     **/
    @Override
    public int getOrder() {
        return 0;
    }
}
